Electric apparatus.



B. G. LAMME.

' ELECTRIC APPARATUS.

APPLICATION FILED MAY 6, 1907.

91 1,01 8. Patented Jan. 26, 1909.

WITNESSES: ll INVENTOR Maw f n BY e 2 g 4 ATTORNEY g in construction andwell a STATES PATENT- OFFICE.

BENJAMIN G. LAMME, OF PIT'ISBUEG, PENNSYLVANIA, ASSIGNClR TOWESTINGHOUSE ELEC- TRIO & MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

EIIIECTRIC APPMLTUB.

No. o11,o1e.

To all whom may concern: I

Be it known that I, Bnmam G.Lamm,

a citizen of the United States, and a residentof Pittsburg, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in, Electric Apparatus, of which the following is aspecification.

My invention relates to electrical apparatus, and has special referenceto the rotatable members of such dynamo-electric machines as areeguipped with laminated core structures an are adaptedto operate atrelatively hi h speeds. u

lhe object of my invention is to provide improved means for themagnetizin'g winding in the slots of aminated core structures that shallbe SlmJllB and durable apted to resist the centrifugal forces which areproduced by hi h-speed rotation.

lectrical gpnerators driven by steam turbines, and ot er high-speeddynamo-electric machines, are often provided withrotatable core memberswhich are built up of a Inrality of magnetizable disks assemble onshafts and have longitudinal peripheral slots to receive anelectric-current-carrying winding. When such machines are rotating athigh speeds, the windings'so located have a tendency, by reason ofcentrifugal forces, to leave the slots and must, there ore, be held inposition by wedges or other suitable means. According to my presentinvention, I provide, for this u ose, segmental strips comprisingrelative y s ort metal blocks that are separated by insulating spacers.In this way, losses resulting from eddy-currents which might be inducedinlonger wedgestrips are materially reduced and, furthermore, strains,which might otherwise-be duced in the core structure, avoided, since aslight circumferentidl justment of the laminae relative to each other ispermitted. While the adjustment just mentioned is scarcely perceptible,ma-

terial strains in the core structure would be produced if it wereprevented by the use of relatively long wedges. i

- My invention is illustrated inLthe accompan ing drawings, in which.

Figure 1 is a sectional elevation of a portion of a laminated-corestructure construct-' ed in accordance with my invention, and

Figs. 2 and 3 are detail views of the segmentalmedge strip shown in Fig.1.

v purification o! fosters Patent. Appmdnfled May 6, am. said in.372,164.

tain the air spaces.

are

Patented Jan. 26, 1909.

Referring to the drawings, the structure here illustrated comprises arotatable shaft 1 and a laminated core member 2, having slots 3 in whichthe current-carrying winding 4 is located, and strips 5 which hold thewinding in position. Each of the strips 5 comprises a plurality ofwedge-blocks 6 of brass or other suitable non-magnetic metal, havinglateral ribs or projections 7, that are separated from each other byinsulating spacers 9.- The side walls of the slots 3 areprovided with 10tudinal grooves 10 near the pe hery of t e core which are engaged by theateral projections from the blocks. The insulating sfiacers 9 may be ofany suitable form and, as ustrated in the drawings, they are shortinsulating pins and each of them is fitted into and projects from asuitable recess 11 in one end of the corresponding block.

It will, of course be readily understood that the wedge-bloclrs of mypresent invention are not restricted in their use to any -particularclass of electrical ap status and that they may be applied to betstationary and rotatable core members, which may or may not belaminated.

1 claim as my invention:

1. In electrical a aratus, the combination with magnetizah e core memberhaving slots therein, of a plurality of coil-retaining blocks disposedin each slot and separated by air spaces, and relatively narrowinsulating spacers disposed between the blocks to main- 2. In electricalapparatus, the combination with a magnetizable core member having slotstherein, and longitudinal ooves in the side walls of the slots, of a purality of metal coil-retaining blocks having projections which engagesaid grooves, and relativel narr'ow insulating spacers between saidlocks. p

y 3. In electrical apparatus, the combination with a laminatedmagnetizable core member longitudinal eripheral slots, and longitudinalgrooves in t e side walls of the slots near'the core surface,"of aplurality jof coil-retaining blocks each of which has a recess in oneend and is provided with lateral plrojections to engage-said grooves,and insuting p'ms secured in andprojecting from the recesses.

4. A magnetizable core having longitudinal slots the side walls of whichare provided with grooves, coils in said slots, metal coilretainingblocks disposed end to end in each i pieces interposed between saidblocks to 10 slot and projecting into said grooves, and maintain saidair spaces.

relatively narrow insulating spacers inter- In testimony whereof, I havehereunto posed between the coil-retaining blocks. subscribed my namethis 27th day of April,

5. A magnetizable core havmg longitudi- 1907.

nal slots rovided with side wall grooves, V BENJ. G. LAMME.

coils in said slots, metal coil-retaining blocks Witnesses:

engaging said grooves and separated by air ELIZABETH LIVINGSTONE,

spaces, and relatively narrow insulating BIRNEY HINES.

